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ASoC: dmaengine-pcm: Add a common DAI DMA data struct

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This patch adds a common DMA data struct which can be used by DAI drivers to
communicate their DMA configuration requirements to the DMA pcm driver.  Having
a common data structure for this allows us to implement common functions on top
of them, which can be used by multiple platforms.

This patch also introduces a new function to initialize certain fields of a
dma_slave_config struct from the common DAI DMA data struct.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen 2013-04-03 11:06:02 +02:00 committed by Mark Brown
parent 5fa70f71db
commit 85c9f9c5f9
2 changed files with 61 additions and 0 deletions
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24
include/sound/dmaengine_pcm.h
View file

@ -44,4 +44,28 @@ int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
/**
* struct snd_dmaengine_dai_dma_data - DAI DMA configuration data
* @addr: Address of the DAI data source or destination register.
* @addr_width: Width of the DAI data source or destination register.
* @maxburst: Maximum number of words(note: words, as in units of the
* src_addr_width member, not bytes) that can be send to or received from the
* DAI in one burst.
* @slave_id: Slave requester id for the DMA channel.
* @filter_data: Custom DMA channel filter data, this will usually be used when
* requesting the DMA channel.
*/
struct snd_dmaengine_dai_dma_data {
dma_addr_t addr;
enum dma_slave_buswidth addr_width;
u32 maxburst;
unsigned int slave_id;
void *filter_data;
};
void snd_dmaengine_pcm_set_config_from_dai_data(
const struct snd_pcm_substream *substream,
const struct snd_dmaengine_dai_dma_data *dma_data,
struct dma_slave_config *config);
#endif

37
sound/soc/soc-dmaengine-pcm.c
View file

@ -95,6 +95,43 @@ int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
}
EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
/**
* snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config
* using DAI DMA data.
* @substream: PCM substream
* @dma_data: DAI DMA data
* @slave_config: DMA slave configuration
*
* Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and
* slave_id fields of the DMA slave config from the same fields of the DAI DMA
* data struct. The src and dst fields will be initialized depending on the
* direction of the substream. If the substream is a playback stream the dst
* fields will be initialized, if it is a capture stream the src fields will be
* initialized. The {dst,src}_addr_width field will only be initialized if the
* addr_width field of the DAI DMA data struct is not equal to
* DMA_SLAVE_BUSWIDTH_UNDEFINED.
*/
void snd_dmaengine_pcm_set_config_from_dai_data(
const struct snd_pcm_substream *substream,
const struct snd_dmaengine_dai_dma_data *dma_data,
struct dma_slave_config *slave_config)
{
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
slave_config->dst_addr = dma_data->addr;
slave_config->dst_maxburst = dma_data->maxburst;
if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
slave_config->dst_addr_width = dma_data->addr_width;
} else {
slave_config->src_addr = dma_data->addr;
slave_config->src_maxburst = dma_data->maxburst;
if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
slave_config->src_addr_width = dma_data->addr_width;
}
slave_config->slave_id = dma_data->slave_id;
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data);
static void dmaengine_pcm_dma_complete(void *arg)
{
struct snd_pcm_substream *substream = arg;